Emiralena Iredale, 1941 accepted as Megalacron I. Rensch, 1934 (source of synonymy)
Helix (Geotrochus) moseleyi E. A. Smith, 1884 accepted as Megalacron novaegeorgiensis (J. C. Cox, 1870) (source of synonymy)
Helix alfredi var. trichroa E. von Martens, 1880 accepted as Megalacron alfredi (J. C. Cox, 1871) (source of synonymy)
Helix barnaclei E. A. Smith, 1877 accepted as Megalacron alfredi (J. C. Cox, 1871) (source of synonymy)
Helix tuffetii Lesson, 1831 accepted as Helix (Helicostyla) coniformis A. Férussac, 1821 accepted as Megalacron coniformis (A. Férussac, 1821) (source of synonymy)
Helix turbinata Deshayes, 1831 accepted as Helix (Helicostyla) coniformis A. Férussac, 1821 accepted as Megalacron coniformis (A. Férussac, 1821) (source of synonymy)
Lisprelia Iredale, 1941 accepted as Megalacron I. Rensch, 1934 (source of synonymy)
Megalacron I. Rensch, 1934 (basis of record)
Megalacron admiralitatis (I. Rensch, 1931) (basis of record)
Megalacron alfredi (J. C. Cox, 1871) (basis of record)
Megalacron boyerii (P. Fischer & Bernardi, 1857) (basis of record)
Megalacron densestriata (Fulton, 1902) (basis of record)
Megalacron juttingae Clench & R. D. Turner, 1964 (original description)
Megalacron klaarwateri (I. Rensch, 1931) (basis of record)
Megalacron lambei (L. Pfeiffer, 1856) (basis of record)
Megalacron lufensis (Thiele, 1928) (basis of record)
Megalacron melanesia Clench & R. D. Turner, 1964 (original description)
Megalacron novaegeorgiensis (J. C. Cox, 1870) (basis of record)
Megalacron novaegeorgiensis creta (I. Rensch, 1934) accepted as Megalacron novaegeorgiensis (J. C. Cox, 1870) (basis of record)
Megalacron periwonensis (Dell, 1955) (basis of record)
Megalacron phaeostoma (L. Pfeiffer, 1877) (basis of record)
Megalacron spadicea (Fulton, 1902) (basis of record)
Megalacron spadicea dunckeri (Leschke, 1912) accepted as Megalacron spadicea (Fulton, 1902) (basis of record)
Megalacron tabarensis anirensis (I. Rensch, 1934) accepted as Megalacron tabarensis (I. Rensch, 1933) (basis of record)
Megalacron tabarensis mahurensis (I. Rensch, 1934) accepted as Megalacron tabarensis (I. Rensch, 1933) (basis of record)
Megalacron tabarensis warrenae Clench & R. D. Turner, 1964 accepted as Megalacron tabarensis (I. Rensch, 1933) (original description)
Papuina enaiensis Leschke, 1912 accepted as Papuina dunckeri Leschke, 1912 accepted as Megalacron spadicea dunckeri (Leschke, 1912) accepted as Megalacron spadicea (Fulton, 1902) (source of synonymy)
Papuina humilis Fulton, 1902 accepted as Megalacron spadicea (Fulton, 1902) (source of synonymy)
Papuina lambei lihirensis I. Rensch, 1934 accepted as Megalacron tabarensis lihirensis (I. Rensch, 1934) accepted as Megalacron tabarensis (I. Rensch, 1933) (source of synonymy)
Papuina lambei matthiae C. R. Boettger, 1918 accepted as Papuina dunckeri Leschke, 1912 accepted as Megalacron spadicea dunckeri (Leschke, 1912) accepted as Megalacron spadicea (Fulton, 1902) (source of synonymy)
Papuina phaeostoma f. densepicta Rolle, 1902 accepted as Megalacron phaeostoma (L. Pfeiffer, 1877) (source of synonymy)
Papuina phaeostoma f. fulgurata Rolle, 1902 accepted as Megalacron phaeostoma (L. Pfeiffer, 1877) (source of synonymy)
Papuina phaeostoma f. pallida Blume, 1920 accepted as Megalacron phaeostoma (L. Pfeiffer, 1877) (source of synonymy)
Papuina phaeostoma f. raremaculata Rolle, 1902 accepted as Megalacron phaeostoma (L. Pfeiffer, 1877) (source of synonymy)
Papuina phaeostoma kandanensis I. Rensch, 1934 accepted as Megalacron phaeostoma mediensis (I. Rensch, 1934) accepted as Megalacron phaeostoma (L. Pfeiffer, 1877) (source of synonymy)
Papuina phaeostoma lamassongensis I. Rensch, 1934 accepted as Megalacron phaeostoma mediensis (I. Rensch, 1934) accepted as Megalacron phaeostoma (L. Pfeiffer, 1877) (source of synonymy)
Papuina phaeostoma var. gracilis Blume, 1920 accepted as Megalacron phaeostoma (L. Pfeiffer, 1877) (source of synonymy)
Pinnadena Iredale, 1941 accepted as Megalacron I. Rensch, 1934 (source of synonymy)
Rhytidoconcha confirmata (I. Rensch, 1933) (basis of record)
Rhytidoconcha inquirenda (I. Rensch, 1929) (basis of record)

Admiralty Islands for Megalacron boyerii (P. Fischer & Bernardi, 1857)  (origin: native)
Admiralty Islands for Megalacron lufensis (Thiele, 1928)  (origin: native)
Admiralty Islands for Rhytidoconcha inquirenda (I. Rensch, 1929)  (origin: native)
Bismarck Archipelago for Megalacron phaeostoma (L. Pfeiffer, 1877)  (origin: native)
Manus Islands for Megalacron admiralitatis (I. Rensch, 1931)  (origin: native)
Manus Islands for Megalacron klaarwateri (I. Rensch, 1931)  (origin: native)
Manus Islands for Megalacron melanesia Clench & R. D. Turner, 1964  (origin: native)
Manus Islands for Rhytidoconcha confirmata (I. Rensch, 1933)  (origin: native)
New Ireland Province for Megalacron bequaerti Clench & R. D. Turner, 1964  (origin: native)
New Ireland Province for Megalacron coniformis (A. Férussac, 1821)  (origin: native)
New Ireland Province for Megalacron densestriata (Fulton, 1902)  (origin: native)
New Ireland Province for Megalacron juttingae Clench & R. D. Turner, 1964  (origin: native)
New Ireland Province for Megalacron lambei (L. Pfeiffer, 1856)  (origin: native)
New Ireland Province for Megalacron spadicea (Fulton, 1902)  (origin: native)
Solomon Islands for Megalacron alfredi (J. C. Cox, 1871)  (origin: native)
Solomon Islands for Megalacron novaegeorgiensis (J. C. Cox, 1870)  (origin: native)